Case for an electronic device



FIG. 1 is a perspective view of the front of a case for an electronic device showing our new design;

FIG. 2 is a front view of a case for an electronic device showing our new design;

FIG. 3 is a back view of a case for an electronic device showing our new design;

FIG. 4 is a side view of a case for an electronic device showing our new design; and,

FIG. 5 is a top view of a case for an electronic device showing our new design.

The broken lines in the drawing depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a case for an electronic device, as shown and described. 